User's session ID under MS Windows 7 and Server 2008 R2

This may be needed sometimes under MS Windows 7 or Server 2008 R2, for any reason ...
find which session ID is associated to a user logged to the machine, interactively or by a Remote Desktop Connection (RDP).

There is a built-in command that you can run from the DOS shell or by the MS PowerShell which is called qwinsta and provides you with all the details about any user session at the moment.

More than 2 Remote Desktop Connections on a MS Windows Server 2008 R2

On a server running on MS Windows Server 2008 R2, by default configuration, only 2 Remote Desktop Connections (RDPs) are allowed. If you need to change that setup, read the following instructions at

http://technet.microsoft.com/en-us/library/cc753380.aspx